[SCSI] aacraid: Fix return code interpretation

Received from Mark Salyzyn

clear_user return is 0 for success, the code fragment is written to
assume that it is the count of the number of bytes zero'd.

Signed-off-by: Mark Haverkamp <markh@osdl.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/aacraid/linit.c

@@ -564,7 +564,7 @@ static long aac_compat_do_ioctl(struct aac_dev *dev, unsigned cmd, unsigned long
 
 		f = compat_alloc_user_space(sizeof(*f));
 		ret = 0;
-		if (clear_user(f, sizeof(*f)) != sizeof(*f))
+		if (clear_user(f, sizeof(*f)))
 			ret = -EFAULT;
 		if (copy_in_user(f, (void __user *)arg, sizeof(struct fib_ioctl) - sizeof(u32)))
 			ret = -EFAULT;